Infected: Tank

TANK: The Tank is a Special Infected of gigantic proportions. The Infection has caused a huge amount of muscle growth, granting it superhuman strength. This monster is capable of throwing large items such as cars or blocks of concrete it rips out of the ground, and bashing through otherwise impenetrable walls. The Tank keeps a high profile, able to be heard by the Survivors from a great distance due to its loud growls and the thrashing it makes when running, and its distinct theme when attacking. The immense strength and sheer toughness of the Tank make it a terrible foe in combat, especially to inexperienced or uncoordinated Survivors. -The Left 4 Dead Wiki

TANK: A huge, muscular infected with amazing strength. Can pick up and throw cars and other large environmental items, smash through concrete walls. Players cannot choose to be the Tank; infected players are randomly chosen to spawn as one. Very loud. When you spawn as the Tank, a frustration meter begins building up for every moment you're not in the presence of Survivors. If this meter fills all the way up, you lose control of the Tank. -Left 4 Dead 411

TANK: The Tank, a gigantic, muscular infected that is powerful and difficult to kill. It can knock players backwards, dealing massive damage, or attack from afar by throwing a lump of debris. It also has the ability to bash certain objects, such as cars and dumpsters, towards survivors, causing incapacitation on contact. The tank is the easiest "boss" infected to find since he's very aggressive and is not shy at all. Tanks will smash through walls and pick up large, heavy objects, and show no mercy. Finding them is easy, killing them is hard. -Wikipedia

A Tank in "Left 4 Dead".